#VU18435 Permissions, Privileges, and Access Controls in systemd - CVE-2019-3843

Vulnerability identifier: #VU18435

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-3843

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
systemd
Server applications / Other server solutions

Vendor: Freedesktop.org

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to an error in the process of binary creation, when the DynamicUser property is used to create a SUID or SGID binary for a systemd service. A local user can abuse the systemd functionality to execute arbitrary code on the target system with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

systemd: 200 - 242 rc4

systemd: before

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External links
https://www.securityfocus.com/bid/108116
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3843
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5JXQAKSTMABZ46EVCRMW62DHWYHTTFES/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.